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Great Response !!

Wow !! Thx Todd.

So based on your post I should put a shut off valve before the RPZ and when I first apply pressure do it gradually. As far as testing? I am a fairly accomplished tech in the mechanical world, so I feel confident I can follow any testing procedues given in the manual. But I will check on a prof test. Also what about a filter? I realize the RP will drop pressure and so will a filter to some degree. I have no exact figure, but at present the two drip zones are using retro DIG heads and if I turn the control valve on to full on, the heads pop closed connectors like crazy. So since these units are supposed to work with retro sprinkler systems, I figure my supply pressure is pretty high. I do know that the supply is direct from the street. My house pressure reg and shut off have no effect.

I will address the Backflow Question. Place your RP prior to any zone valves and prior to any injection or EZ Flow. Also after installation, get it tested by a licensed professional. You will have a high hazard application and need to get it tested.

It is brand new why does it need to be tested? Because during the installation debris, copper or PVC shavings, dirt, anything can get it the device and prevent it from preventing backflow. Also if you don't apply the water to it slowly the first time you charge the line you can cause the seats and springs to get out of alignment and prevent your backflow preventor from preventing backflow. The test will usually be from between 50 and 125.00 for a residential application.

Need advice on backflow devices.

This is a common story.

Major remodeling with landscaping. Existing irrigation being adapted. Now I find the need for expert help.

I will make it simple. If I install a RPZ right after my main feed shutoff valve, can I eliminate all other forms of backflow devices? I have one very high slope in the backyard that has gear drive heads on one zone and then I have 2 drip zones with very little elevation change from the rear zone to the valve station. The front zone is below station elevation. If the RPZ will do the trick, then I can go to regular valves. This will make it easier for me to put pressure reducers in the drip zones. On the EZ Flow? I am playing around with using a forth zone for a misting system for the house. So my guess is the way to hook that up is to place it after the valves using a connector on each valve and on the drip zones and I should put the connectors after the pressure reducers?